For years I used a kitchen salad scale, to weigh my pups, It worked ok but I wanted more accuracy than this gave me. I hopped on Ebay and put in scales and postal scales was one of the choices that came up! It was perfect. It's in my price range ($20) and gives me the accuracy that I desire. This is perfect for toy breeders.
I can even weight my adult Poms on it. I just sit them on the top, tell them to stay, push the hold button (this remembers the weight) and remove my dog and record the numbers.
With the pups, weighting them insures that they are gaining weight properly and through years of tracking weights of my pups, I'm getting a more accurate guess of their adult weight.

Pros: very accurate

Cons: would like a bigger "table" top that the pups stand on when being weighed

If you have small dogs or breed small dogs this is a must. You can weigh each puppy at birth and continue to track their weight. It helps to know this info to insure each pup is getting enough food. It is a bit touchy and you must keep the pup still to get a good reading.

Pros: Works well for small dogs

Cons: Touchy

I have used this to weigh my baby birs to make sure they are gaining weight works great

Pros: great accuracy and reliable

Cons: none